nbc's bay area monte francis is on the lookout for us. >> you can take a look and see that there are surfers and swimmers out in the water and a few hundred people are out here enjoying this labor day weekend. warning signs are no longer posted here saying there was a sighting of a great shark out here attacking a sea lion. last thursday, same thing, an 18-foot great white eating a sea lion. experts say there have been more sightings of great whites along the california coast than usual, but we spoke to an expert today. he said it's not uncommon to see a variety of sharks along the coast, andveinn the bay, particularly between august and december. >> it's not uncommon for them to come into the bay, particularly right underneath the golden gate bridge into the mouth of the bay. they will come in there to feed off sea lions or if a whale carcass drifts in, they might feed on that before heading back out to the ocean. >> a man was attacked a few weeks ago. he was not hurt but there was plenty of teeth marks in his kayak. these recent shark sightings should just be a reminder to people w